Holder for disc saws and the like



Dec. 18, 1956 J. B.- ENGLE 2,774,258

.HOLDER FOR DISC SAWS AND THE LIKE Filed Feb. 9, 1953 2 Sheets-Sheet l f1 o "il Y Dec. 18,1956 J. B. ENGLE 2,774,258

HOLDER fFOR DISC SAWS AND THE LIKE Filed Feb. 9, '1953 2 Sheets-Sheet 2 JNVENTOR. Jghn Eng/e `By a Unite States Patent HOLDER FOR DISC SAWS AND THE LIKE John B. Engle, Los Angeles, Calif.

Application February 9, 1953, VSerial No. 335,898

6 Claims. (Cl. 76-'79) This invention belongs to that general class of devices :known as rotary supports and relates particularly to such supports that hold Vdisc type saws and the like during the process of sharpening and/or setting.

The invention has among its objects the production of a means of the kind described that allows the saw disc 'to rotate freely with a minimum of friction and which is so constructed that bores in the saw discs of various'sizes can be readily accommodated and securely heldin place. The devices are simple, durable and compact in structure, inexpensive toV make and manufacture, dependable and efficient in use and service, and easily mounted securely for immediate use.

lOther objects, advantages and features of this particular invention will appear from a careful Vperusal of the accompanying drawings, the subjoined and detailed description, the preamble of these specifications, and the claims appended hereto. v

Below, applicant describes one or more preferable forms of his invention in order to teach the art thereof 4and show how to make and use the same, but it is to be understood that the drawings and description thereof are not to limit the invention in any sense whatsoever except as the same may be limited by the ,prior pertinent art.

in the drawings:

Figure l is a side elevational View of one form of the invention, showing the upper part thereof in section and falso showing a .portion of the saw disc in section;

1Figure Z is an elevational view of one end of the device;

Figure 3 is an elevational View of the other end of the device;

Figure 4 is a vertical View taken substantially along the `=1ine 4-4 of Figure 1;

Figure 5 is a modified form of the invention showing it in side elevational view with parts in section;

Figure 6 is a side elevational view of another form of the invention.

A portion of the saw to be sharpened is indicated at 1 upon the drawings. Such disc type saws have 'a V'center bore 2 which Varies in size in accordance to the size vo'f the saw blade and/or the shaft upon which it is to -be mounted when used for rotary sawing purposes. ABecause of the various sizedbores, a cone 3 is employed in this invention. VThe conical outer surface 4 thereof can quickly engage the perimeter of different sized bores within certain limits and 'jam portions of the saw blade `againsta suitable stop which is capable of easy rotation.

The cone 3 is herein termed a clamp-cone and has the bearing bore 5 which is readily slidable along a cantilever 'axle 6. This cantilever axle has one end securely vfrozen into' a bore 7 which is part of a clamping body 8; the lower .portion of VthisV body having the slot 9 between the lugs 10 and i1. A threaded Vbore is provided in the lug th'at 'accommodates the threaded stem 12 to which is 'secured 'the ha'ndl'e knob 13. By this means, the device can be easily secured to the ledge of a Workbench and the like.

An integral hollow conical portion 14 extends from ICC the clamp body and has an inner peripheral portion or facing 1'5 which snugly and securely receives the outer race bearing 16 of a ball bearing unit. The inner race bearing 17 is slightly wider than the outer race ring or bearing so as 'to act as a suitable stop for the saw disc to be sharpened as it is the opposing forces of the inner race bearing and the cone 3 that holds the disc 1. It should be obvious that such a construction allows the saw disc to rotate freely with a minimum of friction.

A sleeve 18 has a bore 19 which accommodates the axle rod 6 and has suicient clearance so that this sleeve can easily slide along the rod 6 when moved by the hand grip 2t) which is screwed into a suitable -threaded bore of the sleeve. One end of this sleeve is reduced in size at 21 and frozen into the bore of the inner race 22 of a ball bearing unit. The outer race ring 23 is frozen to the bore 24 of the cone 3 so that when the hand grip member 2d is moved, the sleeve and cone moved together so as to hold or release the disc saw blade 1.

It should now be apparent, that a disc saw blade can be easily placed and held for free-wheeling action between the cone 3 and the inner race ring 17 regardless of the size of the bore in the saw bla-de so that the teeth on the outer perimeter of the saw blade can be easily adjusted to correct position for iing and setting operations at a predetermined Work point. The means for ling and 'setting the teeth of the saw blade is not shown as same is not part of this invention.

The first modied form of this invention, as illus- `trated in Fig. 5 shows a clamping device 25 having the slot 26 and the rotary clamping knob 27. The upper portion of the clamp member 25 has a bore 28 which is frozen onto an axle rod 29. A hollow conical element 30 is proximate the said upper portion and concentric with the axle rod 29 and has the bearing end 31 which accommodates the pair of ball bearing units 32 and 33. The outer bearing races are fixed to the inner surface of the bearing end of the conical element and the vinner races are fixed to the axle rod 29. The abutting end of the upper portion of 25 is reduced in size so as to bear against the inner race ring of the proximate bearing unit 32 so that the conical element can freely rotate about the axle rod.

The -distal end of the axle rod is provided with a cone 34, sleeve 35 and the hand grip 36 for moving the. sleeve and cone. Like the other form of the invention just described, the sleeve 35 and cone 34 can be xed to the axle rod by screwing the grip 36 so that its threaded stern 37 can be squeezed against the flat portion of the axle rod.

The cone 34 has a small end 33 which has a bore that can be easily slid along the rod 29 and a large end 39 that has an inner face to accommodate the bearing unit 4t?. The outer ring or race of this bearing unit is frozen to the conical element 34 and the inner ring or race i's frozen to the outer ,periphery of the reduced portion 41 of the sleeve 35 thus making the element and sleeve move together when the grip 36 is shifted.

The second modified form of the invention, as shown in Fig. 6, has the clamping body 42 with its slot .43 and knob 44 so that it can be clamped toa suitable ledge or ange, not shown. The upper portion 45 of the clamping body has an inner curved face which accommodates the pair of ball bearing units 46 and 47, the outer -races of which are frozen to the housing or upper portion 45 and the inner races of which are frozen to the axle rod 43. Fixed to the side of the inner race of bearing'4`7 and to the axle rod there is the hollow conical'` element 49; which obviously rotates with the axle rod.l Adjust'.- able along the axle rod is the cone 50 and its integral sleeve 51 which has the threaded bore 52 to receive the threaded stud 53. When this stud is turned down against `the at side 54 of the axle rod, the cone and sleeve combination rotate with the axle rod. As in the other forms of the invention, the saw disc to be filed and/or set isy vhellbetween thecone,5,0and ythe element 49 with the V nose portion'of Vcone V50 projectedthroughlthecentral borerof 'the saw blade; .v

It should now be apparent that applicant hasprovided *sawV Sharpeners with a vdisc blade holder so that the teeth Yof such saws Ycan be readily processed and so that the disc can beeasily moved about the axial. center step-by-step land yet firmlyheld in position so as to minimize axial movement. The various parts employed and illustrated in this invention may be of suitable metal or of any other material. be roller bearings Vor any other so called frictionless bearings. Als'o, the means illustrated for clamping the devices Obviously, the ball bearings illustrated mayV "afirmarse:V Y -1- onto, a ledge or ange may take on other forms than to various longitudinal positions on said shaft, means to Y lock said sleeve at a'desired longitudinal position on said shaft, a first bearing race mounted on said clamping body at the peripheral portionrof said recess, a second bearing race mounted in the peripheral portion of said recess andV extending outwardly toward said tapered elementV for engagement with a side surface of said saw blade, rolling Y means Yto associate said first and second races, a third bearing race mounted on said sleeve, a fourth bearingY race mounted on said tapered felement, and rolllng means` Vto associate said third 'rand fourtlrbearing` races, said arrangement being such that upon insertion of said tapered element into a bore in the center portion of said saw blade, said side surface of said saw blade will engage said second bearing race, and said 'second bearing race, fourth bearing race and tapered element will rotate Yfreely rela-- tive to said first and third bearing races. Y p

4. The invention'as claimed in claim 3inwhich said rolling means are balls, and said thir-d and fourth bearing races are constructed to effect longitudinal'shifting of said tapered element in either direction with said sleeve.

5. Apparatus forrotating and holding a disc shaped saw blade during filing, grinding or setting of the teeth Y thereof, whichr comprises an elongated shaft, support lsists of a clamping body which flares out to one side Y thereof, a rod extending from the body and which is concentrically positioned with respect to the ared portion of the body, a bearing unit having inner and outer rings, the flared portion having an inner perimeterV fixed to the outer ring Yof the bearing unit, the inner ring of the bearing unit extending beyond the confines of the outer ring to provide a stop means for a saw blade, a sleeve mounted upon the rod having means for anchoring it at various positions along the rod, a bearing unit'attached to one end of the sleeve, and a cone concentric with the rod and having its larger end fixed to the bearing-unit on the sleeve. f

2. Apparatus for rotating and holding a disc shaped saw blade during filing, grinding or setting of the teeth thereof, which comprises an elongated shaft, support means to support one end portion of said shaft, a clamping body having a generally conical recess, said clamping body encompassing said shaft at such a position that the axis of the wall of said recess is coaxial with said shaft, a coney element mounted on the other end kportion of said shaft in sliding relationship,'said cone element having an exterior conical surface coaxial with said shaft and adapted to enter said conical recess, said exterior conical surface Y being also adapted to enter a central opening in said saw blade and force said saw blade against stop means associated with said clamping body, means to lock said'cone element at various longitudinal positions on said shaft, a 'first bearing race fixed in rotational position relative to said support means, a second bearing race adapted to rotate with said saw blade, and rolling elements mounted between said bearing races to permit substantially frictionless rotation of said saw blade relative to said support means.

3. Apparatus for rotating and holding a disc shaped saw bladeduring tiling, grinding or setting of the teeth thereof, which comprises a clamping body, means to i mount said clamping body on a supporting element in fixed relationship, a shaft mounted in fixed relationship relative to said clamping body and extending into a recess in said clamping body, a tapered element 4mounted on said shaft for sliding movement therealong, the narrower portions of said tapered element being adapted to enter said recess in said clamping body, va sleeve mounted on said shaft on the opposite side of said tapered element from said clamping body, said sleeve being `adapted to slide means to support one end of said shaft, a clamping'body `mounted around said shaft and having an opening rtherein generally coaxial withY said shaft, a conical element mountedslidably and rotatably onsaidshaft and having K 4its narrow end adapted toenter said opening, a YsleeveV mounted slidably on said shaft onV the yother side of said `conical element from said clamping body, means' to lock.

said sleeve at various longitudinal positions on lsaid shaft, a ball bearing element mounted between, saidY clamping bodyY and said shaft to permit substantially frictionless f rotation of said clamping body, and a second ball bearv ing element mounted between the Wide end of said conical element,` and said sleeve to permit substantially frictionless rotation of said conical element-relative to said sleeve and to said shaft, said sleeve and conical element Ybeing adapted to shift together longitudinally of said shaft to effect entry of said narrow end ofsaid conical element into a central opening in said saw blade and thus force a portion of said saw Vblade against an outer por- Y tion of said clamping body.V

6. Apparatus for rotating and holding a disc shaped saw blade during filing, grinding or setting of the teeth thereof, which comprises a support, a first bearing race mounted in said support, a shaft mounted axially ,ofsaid first bearing race, a second bearing race' mounted -be tween said shaft and said lirst bearing race, rolling means mounted between said bearing races to permit substantially frictionless rotation of saidshaft relative to said support, a clamping body mounted onV said shaft adja-V cent to said bearing races and rolling means, said clamping body having an opening facing away from said bear,- ing races and rolling means, a generally conical element mounted slidably on said shaft and having its narrow end adapted to enter said opening in said clamping body, f

and means to lock saidfconical element atvarious 1ongitudinal positions on said shaft.V

References Citedfin the le of this patent' 'UNITED ySTATES ,PATENTS HolmesV Aug. V5, 1952 

